diff --git a/frontend/scripts/vercel-ignore-build.sh b/frontend/scripts/vercel-ignore-build.sh
new file mode 100644
index 000000000..7ce3c5bef
--- /dev/null
+++ b/frontend/scripts/vercel-ignore-build.sh
@@ -0,0 +1,47 @@
+#!/bin/sh
+
+case "${VERCEL_GIT_COMMIT_REF:-}" in dependabot/*) echo 'Dependabot branch, skipping preview'; exit 0;; esac
+
+if [ "${VERCEL_ENV:-}" = "production" ]; then
+  echo "Production build, building"
+  exit 1
+fi
+
+BASE=""
+
+if [ -n "${VERCEL_GIT_PREVIOUS_SHA:-}" ]; then
+  if git cat-file -e "${VERCEL_GIT_PREVIOUS_SHA}^{commit}" 2>/dev/null; then
+    BASE="$VERCEL_GIT_PREVIOUS_SHA"
+  fi
+fi
+
+if [ -z "$BASE" ]; then
+  git fetch --quiet --depth=100 origin main 2>/dev/null || true
+  BASE="$(git merge-base HEAD FETCH_HEAD 2>/dev/null || true)"
+  if [ -z "$BASE" ]; then
+    if git cat-file -e origin/main^{commit} 2>/dev/null; then
+      BASE="origin/main"
+    elif git rev-parse --verify origin/main >/dev/null 2>&1; then
+      BASE="origin/main"
+    fi
+  fi
+fi
+
+if [ -z "$BASE" ]; then
+  echo "No base commit found, building"
+  exit 1
+fi
+
+git diff --quiet "$BASE" HEAD -- .
+STATUS=$?
+
+if [ "$STATUS" -eq 0 ]; then
+  echo "No frontend changes, skipping"
+  exit 0
+elif [ "$STATUS" -eq 1 ]; then
+  echo "frontend changed, building"
+  exit 1
+else
+  echo "Diff failed, building"
+  exit 1
+fi
diff --git a/frontend/vercel.json b/frontend/vercel.json
index 937e522f2..a651703a8 100644
--- a/frontend/vercel.json
+++ b/frontend/vercel.json
@@ -2,7 +2,7 @@
     "version": 2,
     "buildCommand": "npm run build",
     "installCommand": "npm ci",
-    "ignoreCommand": "case \"${VERCEL_GIT_COMMIT_REF:-}\" in dependabot/*) exit 0;; *) exit 1;; esac",
+    "ignoreCommand": "sh scripts/vercel-ignore-build.sh",
     "framework": "nextjs",
     "outputDirectory": ".next",
     "regions": [